Cement mixer



E. H. HOLLIS 2,072,886

CEMENT MIXER March 9, 193 7.

INVENTOR ATTORNEYS March 9, 1937. E HOLLIS 2,072,886

CEMENT MIXER File d Nov. 27, 1935 2 Sheets-Sheet 2 INVENTOR ATTORNEYS Patented Mar. 9, 1937 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to plastic or cement mixers and has for the primary object the provision of a device of this character which will thoroughly mix materials during one passage through the device by providing inner and outer mixing means whereby the materials are thoroughly agitated by both means and caused to pass from one to the other to further agitate and mix said materials before escaping from the device.

With these and other objects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which Figure l is a side elevation illustrating a cement mixer constructed in accordance with my inven- 20 tion.

Figure 2 is a vertical sectional view illustrating the same.

Figure 3 is an end elevation illustrating one end of the device.

Figure 4 is a similar view to Figure 3, showing the other end of the device.

Figure 5 is a transverse sectional view taken on the line 5-5 of Figure 2.

Figure 6 is a side elevation showing the inner mixing element.

Referring in detail to the drawings, the numeral I indicates an outer casing of tubular formation and has one end closed by an end wall 2 provided with a bearing 3. The other end of the casing I is closed by an end wall 4 having a journal 5. Arranged in the bottom of the casing I and adjacent the end wall 2 is a discharge neck 6.

A cylinder 1 is arranged in the casing I and in spaced relation thereto and one end is closed by an end wall 8 to which a shaft 9 is secured. The shaft 9 is supported by the bearing 3. The other end of the tube 1 is closed by an end wall In on which a cylindrical member II is formed. The member I I is supported by the journal 5 and has secured thereto a drive gear I2 arranged exteriorly of the casing I. The gear I2 may be geared to a power source in any suitable manner. The member II receives therein the discharge end of a hopper I3, the latter is supported to the casing I by braces I4. The tube I adjacent the wall 8 has discharge openings I5 and also struck out from said tube is a series of agitating flaps or extensions IS. The extensions I6 are arranged in rows and extend inwardly of the tube. The striking out of the extensions I6 from the tube forms therein openings I! which lie in close proximity to the extensions.

Diagonally extending fins l8 are secured to the inner walls of the tube and are located between the member II and the openings H. The pitch of the fins I8 is such that the material received from the hopper will be caused to travel in the direction of the openings I1 and I5 of the tube.

spirally arranged fins I9 are secured to the outer face of the tube and are located adjacent the openings I I and I5. As material passes through the openings I! the fins I9 feed said material through the casing to the discharge neck 6.

A device constructed in accordance with the foregoing will thoroughly and efliciently mix material due to the fact that materials are first fed into the tube and are agitated by the fins I8 and extensions I6 and pass through the openings I1 and I 5 to the casing I where said materials are again agitated by the fins I9 and fed in the direction of the discharge neck 6.

Having described the invention, I claim:

1. A mixing device comprising an outer casing, an inner casing journaled in the outer casing and spaced from the walls thereof and having a material receiving opening, a hopper in communication with said opening, means for rotating the inner casing, a discharge neck in the outer casing, said inner casing having a series of openings, extensions formed on the inner casing and located adjacent certain of said openings, and means carried by the inner casing to agitate materials in said inner casing and in said outer casing.

2. A mixing device comprising an outer casing, an inner casing journaled in the outer casing and spaced from the walls thereof and having a material receiving opening, a hopper in communication with said opening, means for rotating the inner casing, a discharge neck in the outer casing, said inner casing having a series of openings, extensions formed on the inner casing and located adjacent certain of said openings, fins secured to the inner casing and arranged between certain of said openings and the intake opening, and spirally arranged fins secured to the outer face of the inner casing.

ELMER H. HOLLIS. 

